Hi Hellbore,
Im a LEO officer and a flashaholic. Im going to suggest that you look at spending the money up front and looking at some of the fancier stuff available out there.
A surefire host with a Malkoff drop in is great. Also so are many of Nailbenders drop ins. I DO NOT USE multimode lights. I have done training with the kinds where you cycle the tail cap (multiple clicks) and TRUST ME your going to end up in low mode or strobe mode when you just want light. High stress = shaking = not thinking = not holding the momentary tail cap on = cycling through outputs. Its all going to depend on what kind of output your looking at.
I suggest that you look at flood lights rather than huge throwers for your primary light. The majority of targets your going to engage (and the majority of gun fights) happen at very close range, say inside 10 feet. So why have a narrow beam with a hot spot, are you going to be engaging a target at 150 feet with your pistol? I don't think so. Flood lights also help you fight off tunnel vision when under stress as they dont further illuminate just a path.
My last suggestion is get something at least neutral in tint and preferably WARM. It is amazing how many things you miss in an outdoor setting with a BLUE tinted light. I have walked right by people hiding in forests with an LED and found people coming back with my incan. Hence why the new set up is coming in (see below)
My suggestion to you is to cary two lights. A bright LED primary, 2 cr123 1X18650 light and a larger Search Light to reach out and touch people. Look for cell redundancy, be it 18650, 123 or 17670.
I started with the Pila Gl2 and Pila GL4. The GL2 has a WolfEyes drop in R2 bin Cree and is VERY blue, so much so that it is getting upgraded. The GL4 is a D36 head and has a custom LF 630 lumen D36 style bulb in it, powered by 2 X 18650 cells. They are both going to be at home lights now, as a Surefire M2 Oveready V3 Tripple Neutral is going to be my primary light and a Surefire M6 w/PHD M6 and probably MN61 or MN21 or LF IMR-M3T is going to be the bulb. I also purchased a Surefire M4 with a LF P7 LED Turbo Head which can also fit on the M6 body, cause it was a good deal.
I personally am not a fan of the dog bone style lights (2 long cells, Pila GL4 Surefire M4) as I find them awkwardly long. Choice is yours.
Go speak to the guys at oveready.com They are all CPF people and they can hook you up. They build extreme lights and have Malkoff right off their sight. I cannot say enough good things about Dan and Sarah. Youll spend a little more money up front, however it will pay dividends in the long run. The Surefire Hosts are the industry standard always copied, seldom duplicated with GREAT warranty. Likely you will always be able to keep them current and on top of the game!
Let me know if you have any other questions,
Stephen